Novel water-based processing of graphene oxide and sub-micrometric alumina towards tougher and electrically-conductive structural ceramics
[EN] Balancing the mechanical and functional properties of graphene-reinforced ceramics can be a challenge because agglomeration of the reinforcement must be avoided to minimise microstructural defects and it is difficult to organise the constituents into meaningful structures. The water-based proce...
| Authors: | , , , , , , , , , |
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| Format: | article |
| Publication Date: | 2025 |
| Country: | España |
| Institution: | Universitat Politècnica de València (UPV) |
| Repository: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Language: | English |
| OAI Identifier: | oai:dnet:riunet______::672082f5b615784089c2279a38061d16 |
| Online Access: | https://riunet.upv.es/handle/10251/234924 |
| Access Level: | Open access |
| Keyword: | Graphene Alumina Ceramic-based composites Freeze-casting Spark plasma sintering |
| Summary: | [EN] Balancing the mechanical and functional properties of graphene-reinforced ceramics can be a challenge because agglomeration of the reinforcement must be avoided to minimise microstructural defects and it is difficult to organise the constituents into meaningful structures. The water-based processing strategy that is demonstrated here illustrates the potential to fabricate layered alumina composites using a combination of freeze-casting, vacuum infiltration, and spark plasma sintering. Layers of alumina between 0.5 and 7 ¿m thick and consist of an average grain size of 0.7 ± 0.4 ¿m were separated by highly-oriented reduced graphene oxide. Mechanical and functional properties were investigated alongside a monolithic counterpart sintered at 1300 ¿C. The flexural strength and fracture toughness increased from 262 to 314 MPa and 3.5¿5.4 MPa m1/2 respectively, whilst electrical conductivity rose by nine orders of magnitude to 10¿ 1 S cm¿ 1 . |
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